A020642 n-th composite is sum of first k composites for some k.

1, 5, 10, 17, 33, 44, 56, 69, 82, 99, 116, 134, 175, 196, 242, 267, 321, 349, 377, 408, 442, 475, 507, 542, 581, 619, 659, 700, 741, 785, 966, 1015, 1065, 1111, 1167, 1273, 1329, 1383, 1563, 1622, 1687, 1751, 1949, 2017, 2084, 2159, 2231, 2302, 2375, 2449, 2685

Offset

1,2

Links

Table of n, a(n) for n=1..51.

Crossrefs

Cf. A013919, A013920, A013921.

Sequence in context: A086653 A215449 A174062 * A067253 A284703 A048822

Adjacent sequences: A020639 A020640 A020641 * A020643 A020644 A020645

Keyword

nonn

Author

N. J. A. Sloane, Henri Lifchitz, David W. Wilson

Status

approved